Finding the value of the list element is not really helping you as the table is not an element of the list. If you know there is only one table, this verbose example may help:

# get all the tables
my @tables = $tree->findnodes('//table');
# get the first table
my $table = $tables[0];
# get all the rows of first table
my @rows = $table->findnodes('tr');

# loop through the rows
for my $row ( @rows ) {
    # get all the cells
    my @cells = $row->findnodes('td');
    # loop through the cells
    for my $cell ( @cells ) {
        print $cell->as_text, "\n";
    }
}

Output:

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